#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>
int main()
{
	int n;
	scanf("%d", &n);

	if ((n % 4 == 0 && n % 100 != 0) || n % 400 == 0)
		printf("%d is a leap year!", n);
	else
		printf("%d isn't a leap year!", n);
	return 0;
}